Hay-grinding machine.



s; a. ROBERTS.

HAY GRINDING MACHINE. I APPLICATION FILED APR-5, 1910. RENEWED OUT. 10, 1911. I 1,027,765. Patented May 28, 1912.

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Witnesses NM-UIIIA muoanm CD-I WASNIIONN' D- C- 8.. G. ROBERTS. HAY GRINDING MACHINE. APPLICATION FILED APILB, 1910. RENEWED OCT. 10, 1911.

1,027,765. Patented May 28, 1912.

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'- My improved mill consists essentially of a UNITED srArns PATENT OFFICE.

sHEmviAn o. ROBERTS, o 'wIoHrrA, KANSAS.

HAY-GRINDING MACHINE.

Application filed April 5, 1910,. Serial-N0. 553,583.

To all whom it may concern Be it known that I, SHERMAN C. Ronnn'rs, citizen of the United States, residing at Vichita, in the county of Sedgwick and State of Kansas, have invented certain new and useful Improvements in Hay-Grinding Machines, of which the following is a specification.

This invention comprehends certain new and useful improvements in mills of that type designed particularly for use in grinding hay or the like, so as to provide a comminuted product that is susceptible of beingv fed to cattle, or utilized for various other purposes. The invention has for its object an improved machine of this character which embodies a concave and a cylinder rotating therein, and in which the concave is com-' posed of a plurality of screen sections through which the reduced material passes. The screen sections are supported in a peculiar manner, so as to be susceptible of being removed with facility to admit of their, replacement. by new sections or sections of a larger or smaller mesh, one of said screen sections being arranged to be adjusted toward or away from thecylinder to adapt itself to the quantity and condition of the material fed into the machine. 7

With this and other, objects in view that will more fully appear as the description proceeds, the invention consists in certain constructions and arrangements of the parts that I shall hereinafter fully describe and then point out the novel features thereof in the appended claims.

For a full understanding of the invention and the merits thereof and to acquire a knowledge of the details of construction, ref erence is to be had to the following description and accompanying drawings, in which:

Figure 1 is a transverse-section of a mill constructed in accordance with my invention; Fig. 2 is a similar view thereof showing the top screen section and its supporting v bars swung over into an inoperative posi-: tion; Fig. 3 is a detail sectional View on the line 5-5 of Fig. 1. 4

(lorresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Specification of Letters Patent.

cylinder, A, which is supported upon the Patented May 28,1912.

Renewed October 10, 1911. Serial No. 653,966.

framework of the machine, so as to be susceptible of rotation about a longitudinal axis, and which may be driven by any suitable means (not shown), the cylinder being partly inclosed by and arranged in operative relation to a concave, B. The concave, 13, extends about three-fourths of theway around the cylinder and is constructed in a plurality of substantially duplicate segmental sections, each of which embodies a transversely curved frame 7, to which the meshed fabric 8 is applied. Two or more of these sections, designated 9, constitute the lower substantially semicylindrical portion of the concave and are slidingly fitted at their opposite ends in semi-circular channels or grooves 10 formed in the opposing faces of a pair of curved supporting bars 11. A pair of curved supporting bars 13 are pivotally connected at one end, as indicated at 15, to the rear ends of the respective supporting bars 11. The supporting bars 18 are formed in their op posing faces with curved channels 12 in which the opposite ends of the upper section 9 are slidably fitted, said section being supported at the rear side of the cylinder and curving forwardly above the same in its operative position, as illustrated in Fig. 1. The upper orforward edge of the section 9 normally lies in a vertical plane through the axis of the cylinder and is spaced from the upper edge of the'forward section 9, so as to afford a mouth throughrwhich the hay or similar material may be fed in any suitable manner. Such material first passes between the upper section 9 and the cylinder and is then carried around by the latter to the lower sections 9 of the concave through which it falls after having been reduced by the action of the teeth 9* on the cylinder A, attention being particularly directed to the fact that the concave is disposed somewhat spirally in respect to the axis of the cylinder with the upper portion 9 considerablyspaced therefrom to accommodate the material in its bulky condition, the concave gradually approaching the extremities of the teeth, so as to hold the material in close relation thereto as it becomes .comminuted.

The section 9 is preferably equipped at its forward edge with a metallic plate or the like which constitutes a baffle 14 to prevent hard substances from entering the machine as would, of course, result in damage thereto.

The supporting bars 13 are formed above their pivoted ends with one or more outstanding slotted ears 16, screws 17 being inserted through the slots and engaged with the framework of the machine to hold said bars against turning movement and to maintain the concave section 9 in different adjusted positions with respect to the cylinder to compensate for the quantity and condition of the material fed into the machine. The channels 10 and 12 open outwardly at the pivoted ends of the supporting bars, but are closed at their other or remote ends. In the operative position of the concave the open ends of the adjacent channels are arranged in registry, so that one channel forms a continuation of the other and the concave sections are thus retained in the channels against removal. By removing the screws 17 the bars 13 may be swung over backwardly about their pivots 15, so as to throw the said channels out of registry, whereby the screen sections may be withdrawn therefrom, as may be desirable to admit of their replacement by screen of larger or smaller mesh, or by new sections in event of damage.

Among the many advantages attained by constructing the concave in sections, it is to be observed that should one of the sections become damaged, such'section may be conveniently removed and repaired or replaced by a new one, since the parts are readily in terchangeable, thereby effecting a material economy over the ordinary machines having the concaves all made of one piece, which latter machines must have the entire concave repaired in event of damage, at a great expenditure of time and labor.

It will here be noted that the seating grooves in the stationary bars 11 open through the, rear ends thereof only, while the seating grooves in the movable bars 13 register with the grooves in the stationary bars so that when the movable bars are swung in the direction of the cylinder, the ends of adjacent screen sections will abut and prevent accidental displacement thereof and when the fastening devices 17 are removed and the movable bars 13 swung laterally to inoperative position, the screen sections of both the upper and lower set of bars may be readily removed. It will also be noted that the member let not only forms a baffle plate, but also serves to connect the forward ends of the movable bars 18 and at the same time forms a closure for the forward ends of the segmental slots in said movable bars.

Having thus described the invention What 1s claimed as new 1s:

1. In a grmdmg mill, the combination with a cylinder, of spaced stationary bars surrounding the lower portion of the cylinder and having segmental seating grooves formed therein and opening through the rear ends of said bars only, movable bars surrounding a portion of the top of the cylinder and having their rear ends pivotally connected with the stationary bars and their forward ends spaced from the forward ends of said stationary bars to form a feed opening at the front of the cylinder, said mov able bars being provided with segmental seating grooves closed at their forward ends and communicating with the grooves of the stationary bars at their rear ends, removable screen sections seated in the grooves of the stationary and movable bars, and means for adjusting the movable bars laterally with respect to the cylinder.

2. In a grinding mill, the combination with a cylinder, of spaced stationary bars surrounding the lower portion of the cylin-v der and having segmental seating grooves formed therein and opening through the rear ends of said bars only, movable bars surrounding a portion of the top of the cylinder and having their rear ends pivotally connected with the stationary ba and their forward ends spaced from the forward ends of said stationary bars to form a feed opening at the front of the cylinder, said movable bars being provided with segmental seating grooves registering with the seating grooves of the stationary bars and having their outer walls provided with slot-ted ears, a battle plate connecting the forward ends of the movable bars and seated within and forming closures for the ends of the segmental grooves of said movable bars, removable screen sections seated in the grooves of the stationary bars, a removable screen sect-ion seated in the grooves of the movable bars and having one end thereof bearing against the baflie plate and its other end adapted to contact with the adjacent segmental screen section of the stationary bars, and fastening devices extending through the slots in said ears for holding the movable bars in difierent positions of adjustment with respect to the cylinder.

In testimony whereof I affix my signature in presence of two witnesses.

SHERMAN C. ROBERTS. [11. s]

WVitnesses:

LYMAN WooDRUrr, FRED R. HAMMUT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

